JAI CV-A1-20 - Manual (Page 15)

CV-A1-20
6.8. Long Time Exposure Mode
The exposure time is the interval between 2 external VD pulses sent to the VD input. The
exposure starts after the input of a VD, and it ends after the next VD input, which again starts a
new exposure. The interval between the external VD pulses (exposure time) can be from V to ∞.
Thermal and dark current noise will increase by accumulation time, therefore the exposure time
is not recommended to exceed 2 seconds (or 30 V periods). The external applied sync system
should follow the camera scan system.
The long time exposure is a continuous process where each external VD pulse will synchronize
the camera, stop an exposure, start a new exposure and read out the previous accumulated
video signal.
A WEN pulse indicates that the resulting video is being read out.
To use this mode:
Set function:
Trigger mode “Long Time Exposure” TR = 4
Polarity and other functions
Input: Ext. VD to pin 7 on 12-pin connector.
Ext. HD to pin 6 on12-pin connector. (If used).
Important notes on using this mode.
• Depending of the temperature, it is not recommended to use integration time >2 sec.
1H = 83.6 µs
No equalize and serration pulses.
No equalize and serration pulses.
Fig. 23. Long time exposure
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